120% is the change from 135 to 297
Calculation steps:
[( 297 - 135 ) ÷ 135] x 100 = 120%
Formula
Percentage change = [(297 - 135) / 135] x 100
Subtract the new number by the original number
297 - 135 = 162
162 ÷ 135 = 1.2
1.2 x 100 = 120%
Example